Tractor cab



FIG. 1 is a perspective view showing the front and one side of my new design for a tractor cab it being understood that the broken lines are for illustrative purposes only;

FIG. 2 is a perspective view showing the rear and opposite side thereof;

FIG. 3 is an enlarged top plan view thereof;

FIG. 4 is an enlarged front elevational view thereof;

FIG. 5 is an enlarged side elevational view thereof; and

FIG. 6 is an enlarged rear elevational view thereof. 

The ornamental design for a tractor cab, as shown and described. 